Nortel Networks NN43001-563 - Manual (Page 427)

System performance under heavy load 427
Normal resolutions
The following are possible resolutions:
• If the D-channel pack (such as MSDL) has multiple D-channels on it,
the D-channel CPU might be unable to sustain the maximum traffic,
especially if both or all D-channels peak at the same time. If this traffic
level is sustained long enough, it can result in an MSDL0304 error
message.
• If the IP trunk card that houses the C-channel card (DCHIP Leader) also
acts as Leader or Backup Leader for the node, it can become severely
over-tasked. To resolve this situation, separate the D-channel and IP
functions; that is, have the DCHIP Leader reside on a Follower card.
• If none of these apply, consider splitting the IP Trunk 3.01 (and later)
node into two or more DCHIP Leader and Follower groups. This reduces
the workload of the DCHIP Leader and allows the Leader to carry less
of the signaling traffic.
Message: MSDL0304
Description
Message MSDL0304 is usually preceded by or followed by numerous
PRI241 messages.
The MSDL0304 message says:
"The Meridian 1/CS 1000M received 100 or more messages from MSDL x
within two seconds. At this level of message transfer, there may be some
impact to the overall system performance. The level of service does not
warrant removing the card from service."
Normal cause
There are too many high-traffic D-channels on this MSDL card.
Normal resolutions
The following are possible resolutions:
• Carry the D-channel on two or more MSDL CARDS.
• If the MSDL card is an older vintage, it might be possible to upgrade the
MSDL pack. This is the exception, rather than the rule; lower-capability
MSDL packs have usually already been removed from service.
Message: BUG4005
Description
The system has lost a time slot, idling the applicable Call Register.
Nortel Communication Server 1000
IP Trunk Fundamentals
NN43001-563 01.01 Standard
Release 5.0 30 May 2007
Copyright © 2007, Nortel Networks
.